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    <title>geojson-vt integration</title>
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          <h4 id="title">geojson-vt integration</h4>
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          <p id="shortdesc">Slice GeoJSON into vector tiles on the fly in the browser.</p>
          <div id="docs"><p>Example of integration with <a href="https://github.com/mapbox/geojson-vt">geojson-vt</a> library.</p>
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          <div id="api-links">Related API documentation: <ul class="inline"><li><a href="../apidoc/ol.Map.html" title="API documentation for ol.Map">ol.Map</a></li>,<li><a href="../apidoc/ol.View.html" title="API documentation for ol.View">ol.View</a></li>,<li><a href="../apidoc/ol.format.GeoJSON.html" title="API documentation for ol.format.GeoJSON">ol.format.GeoJSON</a></li>,<li><a href="../apidoc/ol.source.OSM.html" title="API documentation for ol.source.OSM">ol.source.OSM</a></li>,<li><a href="../apidoc/ol.source.VectorTile.html" title="API documentation for ol.source.VectorTile">ol.source.VectorTile</a></li>,<li><a href="../apidoc/ol.layer.Tile.html" title="API documentation for ol.layer.Tile">ol.layer.Tile</a></li>,<li><a href="../apidoc/ol.layer.VectorTile.html" title="API documentation for ol.layer.VectorTile">ol.layer.VectorTile</a></li>,<li><a href="../apidoc/ol.proj.Projection.html" title="API documentation for ol.proj.Projection">ol.proj.Projection</a></li></ul></div>
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          <textarea class="hidden" name="title">geojson-vt integration</textarea>
          <textarea class="hidden" name="description">Slice GeoJSON into vector tiles on the fly in the browser.</textarea>
          <textarea class="hidden" name="js">var replacer &#x3D; function(key, value) {
  if (value.geometry) {
    var type;
    var rawType &#x3D; value.type;
    var geometry &#x3D; value.geometry;

    if (rawType &#x3D;&#x3D;&#x3D; 1) {
      type &#x3D; &#x27;MultiPoint&#x27;;
      if (geometry.length &#x3D;&#x3D; 1) {
        type &#x3D; &#x27;Point&#x27;;
        geometry &#x3D; geometry[0];
      }
    } else if (rawType &#x3D;&#x3D;&#x3D; 2) {
      type &#x3D; &#x27;MultiLineString&#x27;;
      if (geometry.length &#x3D;&#x3D; 1) {
        type &#x3D; &#x27;LineString&#x27;;
        geometry &#x3D; geometry[0];
      }
    } else if (rawType &#x3D;&#x3D;&#x3D; 3) {
      type &#x3D; &#x27;Polygon&#x27;;
      if (geometry.length &gt; 1) {
        type &#x3D; &#x27;MultiPolygon&#x27;;
        geometry &#x3D; [geometry];
      }
    }

    return {
      &#x27;type&#x27;: &#x27;Feature&#x27;,
      &#x27;geometry&#x27;: {
        &#x27;type&#x27;: type,
        &#x27;coordinates&#x27;: geometry
      },
      &#x27;properties&#x27;: value.tags
    };
  } else {
    return value;
  }
};

var tilePixels &#x3D; new ol.proj.Projection({
  code: &#x27;TILE_PIXELS&#x27;,
  units: &#x27;tile-pixels&#x27;
});

var map &#x3D; new ol.Map({
  layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM()
    })
  ],
  target: &#x27;map&#x27;,
  view: new ol.View({
    center: [0, 0],
    zoom: 2
  })
});

var url &#x3D; &#x27;https://openlayers.org/en/v4.4.2/examples/data/geojson/countries.geojson&#x27;;
fetch(url).then(function(response) {
  return response.json();
}).then(function(json) {
  var tileIndex &#x3D; geojsonvt(json, {
    extent: 4096,
    debug: 1
  });
  var vectorSource &#x3D; new ol.source.VectorTile({
    format: new ol.format.GeoJSON(),
    tileLoadFunction: function(tile) {
      var format &#x3D; tile.getFormat();
      var tileCoord &#x3D; tile.getTileCoord();
      var data &#x3D; tileIndex.getTile(tileCoord[0], tileCoord[1], -tileCoord[2] - 1);

      var features &#x3D; format.readFeatures(
          JSON.stringify({
            type: &#x27;FeatureCollection&#x27;,
            features: data ? data.features : []
          }, replacer));
      tile.setLoader(function() {
        tile.setFeatures(features);
        tile.setProjection(tilePixels);
      });
    },
    url: &#x27;data:&#x27; // arbitrary url, we don&#x27;t use it in the tileLoadFunction
  });
  var vectorLayer &#x3D; new ol.layer.VectorTile({
    source: vectorSource
  });
  map.addLayer(vectorLayer);
});
</textarea>
          <textarea class="hidden" name="css"></textarea>
          <textarea class="hidden" name="html">&lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
</textarea>
          <input type="hidden" name="resources" value="https://openlayers.org/en/v4.4.2/css/ol.css,https://openlayers.org/en/v4.4.2/build/ol.js,https://mapbox.github.io/geojson-vt/geojson-vt-dev.js">
          <input type="hidden" name="data">
        </form>
        <pre><code id="example-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html&gt;
  &lt;head&gt;
    &lt;title&gt;geojson-vt integration&lt;/title&gt;
    &lt;link rel="stylesheet" href="https://openlayers.org/en/v4.4.2/css/ol.css" type="text/css"&gt;
    &lt;!-- The line below is only needed for old environments like Internet Explorer and Android 4.x --&gt;
    &lt;script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"&gt;&lt;/script&gt;
    &lt;script src="https://openlayers.org/en/v4.4.2/build/ol.js"&gt;&lt;/script&gt;
    &lt;script src&#x3D;&quot;https://mapbox.github.io/geojson-vt/geojson-vt-dev.js&quot;&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
    &lt;script&gt;
      var replacer &#x3D; function(key, value) {
        if (value.geometry) {
          var type;
          var rawType &#x3D; value.type;
          var geometry &#x3D; value.geometry;

          if (rawType &#x3D;&#x3D;&#x3D; 1) {
            type &#x3D; &#x27;MultiPoint&#x27;;
            if (geometry.length &#x3D;&#x3D; 1) {
              type &#x3D; &#x27;Point&#x27;;
              geometry &#x3D; geometry[0];
            }
          } else if (rawType &#x3D;&#x3D;&#x3D; 2) {
            type &#x3D; &#x27;MultiLineString&#x27;;
            if (geometry.length &#x3D;&#x3D; 1) {
              type &#x3D; &#x27;LineString&#x27;;
              geometry &#x3D; geometry[0];
            }
          } else if (rawType &#x3D;&#x3D;&#x3D; 3) {
            type &#x3D; &#x27;Polygon&#x27;;
            if (geometry.length &gt; 1) {
              type &#x3D; &#x27;MultiPolygon&#x27;;
              geometry &#x3D; [geometry];
            }
          }

          return {
            &#x27;type&#x27;: &#x27;Feature&#x27;,
            &#x27;geometry&#x27;: {
              &#x27;type&#x27;: type,
              &#x27;coordinates&#x27;: geometry
            },
            &#x27;properties&#x27;: value.tags
          };
        } else {
          return value;
        }
      };

      var tilePixels &#x3D; new ol.proj.Projection({
        code: &#x27;TILE_PIXELS&#x27;,
        units: &#x27;tile-pixels&#x27;
      });

      var map &#x3D; new ol.Map({
        layers: [
          new ol.layer.Tile({
            source: new ol.source.OSM()
          })
        ],
        target: &#x27;map&#x27;,
        view: new ol.View({
          center: [0, 0],
          zoom: 2
        })
      });

      var url &#x3D; &#x27;https://openlayers.org/en/v4.4.2/examples/data/geojson/countries.geojson&#x27;;
      fetch(url).then(function(response) {
        return response.json();
      }).then(function(json) {
        var tileIndex &#x3D; geojsonvt(json, {
          extent: 4096,
          debug: 1
        });
        var vectorSource &#x3D; new ol.source.VectorTile({
          format: new ol.format.GeoJSON(),
          tileLoadFunction: function(tile) {
            var format &#x3D; tile.getFormat();
            var tileCoord &#x3D; tile.getTileCoord();
            var data &#x3D; tileIndex.getTile(tileCoord[0], tileCoord[1], -tileCoord[2] - 1);

            var features &#x3D; format.readFeatures(
                JSON.stringify({
                  type: &#x27;FeatureCollection&#x27;,
                  features: data ? data.features : []
                }, replacer));
            tile.setLoader(function() {
              tile.setFeatures(features);
              tile.setProjection(tilePixels);
            });
          },
          url: &#x27;data:&#x27; // arbitrary url, we don&#x27;t use it in the tileLoadFunction
        });
        var vectorLayer &#x3D; new ol.layer.VectorTile({
          source: vectorSource
        });
        map.addLayer(vectorLayer);
      });
    &lt;/script&gt;
  &lt;/body&gt;
&lt;/html&gt;</code></pre>
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